Hi Yeagen. I'm 58 as well, T1 for 30 years. Welcome to the club no one wants to join!
It sounds like you're basically doing the right thing, so don't give up yet. My own frustration level got really high at the start, so I sympathize. Non-deliveries are annoying as heck, but one of the most insidious things is not getting all the air bubbles out of the reservoir when you're loading it up. You end up having voids in the tubing and the system "thinks" it's delivering insulin that's not actually there. I had a lot of trouble with that. I make sure to let the vial warm up for 30 min. before changing sets, which is a pain, but it seems to help.
There's also the fact that the Dr's tend to be very cautious and incremental about getting your basal rates dialed in--with a mechanical device dosing you continuously it's easy to get in trouble and lows are more dangerous in the immediate term than the highs. So it can take a while before you get the whole thing tuned to your metabolism.
There are lots of good people on this site you can chat with as well. I've found it one of the more helpful and supportive communities I've tried. Good luck and keep us posted on how it's going!